Bolt-cutter head



(No Model.) 5 Sheets-Sheet 1.

M. D. LUEHRS.

BOLT CUTTER HEAD.

No. 324,946. 00 P wented Aug. 25, 1885.

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(No Model.)

M. D LUEHRS 5Sheets Sheet 2.

BOLT CUTTER HEAD.

No. 324,946. Patented Aug. 25, 1885.

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(No Model.) 5 Sheets-Sheet 3.

M. D. LUEHRS.

BOLT CUTTER HEAD.

No. 324,946. Patented Aug. 25, 1885.

(No Model.)

5 Sheets-Sheet 4. M. D. LUEHRS.

BOLT CUTTER HEAD.

No. 824,946. Patented Aug; 25, 1885.

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(No Model.) 5 Sheets-Sheet 5.

M. D. LUEHRS.

BOLT CUTTER HEAD.

No. 324,946 Patented Aug. 25, 1885.

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llIICIIEL D. LUEHRS, OF CLEVELAND, OHIO.

BOLT-CUTTER HEAD.

SPECIFICATION forming part of Letters Patent No. 324,948, dated August 25, 1885.

Application filed April 2, 1884.

To aZZ whom it may concern:

Be it known that l, MICHEL D. LUEHRS, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Bolt-Cutter Heads; and I do hereby declare the following to be a description of the same, and of the manner of constructing and using the invention, in. such full, clear, concise, and exact terms as to enable any person skilled in the art to which it appertains to construct and use the same, reference beinghad to the accompanying drawings, forming a part of the specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

One end in view in devising this invention was to provide a construction of few parts. A further end was to make the construction without a ring which engages directly with the dies, said construction being also adapted for the use of dies varying in length toany desired extent. An additional object was to positively retract the dies from operative position by a working-ring located outside of the plane of the dies. Still another object was to lock the dies in operative position by said working-ring; and, lastly, I desired to obtain a radial adjustment of the dies in a quick and accurate manner.

With these several ends in view my invention consists of principles of construction and operation capable of being carried out in different mechanical ways, certain ones of which are illustrated in the drawings, as follows:

Figure 1 is a longitudinal horizontal section of one form of the invention. Fig. 2 is afront elevation of the same. Fig. 8 is a plan of a second form of the invention, the top arm thereof being broken away. Fig. 4 is a longitudinal central section of the double ring shownin thepreceding view. Fig. 5 is a front elevation of the double ring. Fig. 6 is a plan of a third form of the invention. Fig. 7 is a front elevation of same. Fig. 8 is a plan of the upper part of the bipartite ring. Fig. 9 is an elevation of the part shown in preceding view. Fig. 10 is a side view, Fig. 11 an end view, and Fig. 12 a horizontal section, of

in which the dies A are located.

(No model.)

a modified form of die-holder, which may be used in substitution for the die-holders shown in Figs. 1 and 2, and which, like them, is adapted to dies of any and varying length. Fig. 13 is a detail section of a modified form of die-holder according to which the rocking levers are detachably connected to said dieholder. Fig. 14c is a detail of the rocking lever of the preceding view. Fig. 15 is a detail side view representinga die directly coir nected to its rocking lever. Fig. 16 is a front elevation of the preceding view.

The construction represented in the first two figures shows four rocking levers, A, respectively working in openings formed at equidistant quadrant-points of the barrel. Each lever has its forward extremity connected directly to a die-holder, a, and they are all operated by a bipartite ring adapted to have sliding movement longitudinally on the barrel, said ring being located outside ofthe plane One section, 0, of this ring is loosely fitted to have re ciprocating revolving movementwithin the other section, 1). It is provided with set-bolt a, rigid therewith, and working in peripl'icral slot 1), formed in section D. A nut, c, is threaded on the extremity of the bolt, which projects from the slot, and thus clamps the revolving section at any desired adjustment to the rectilinear sliding section. To aid in the rapidity and accuracy of such adjustment, a scale, (I, and index-finger c are provided. respectively, on the two sections. The object of this reciprocal revolution is to cause the dies to be at any desired distance from the axis of the head when clamped in operative position as may be required by the diameter of the article to be threaded. To this end I form a series of cams on the forward portion of the inner periphery of the revolving ring-section; and to obviate binding of the ring, and secure nicety of operation of the parts, I form a companion. series of cams on the rear portion of the ring periphery. A further consideration is to lock riphery of the revolving section 0 has its forward and rear portions, respectively, pro\ ided with a series of four inclined cams, h h. (See Figs. 4 and 5.) Each series has its four cams inclined in the same circular direction considered above; but the cams of the front series, h, incline in opposite circular direction to the cams h of the rear series. In the rear of each cam of the front series there is a corresponding]yshaped but oppositely-inclined cam in the rear series. These two series of cams engage, respectively, with fiat surfaces Z and is, formed on the front and rear ends of each of the rocking levers. By the engagement of these flat bearings with the ring the said levers are locked, and accidental movement is impossible. The .ring is prevented from binding in this lever-locking by the opposite inclinations of the two series of cams.

Section D of the bipartite ring is provided with a pin,f, fitting in a guide slot, g, formed longitudinally in the barrel, whereby said section is maintained in rectilinear movement as it slides to and fro on the barrel. Any suitable means may be employed for operating the ring in this rectilinear movement.

The bipartite ring is shownin different forms of mechanical detail respectivelyin the different heads illustrated in Figs. 1 and 3, while in the head illustrated in Fig. 6 I have shown a single ring adapted to have rectilinear sliding movement on the barrel, no provision being made therein for adjustment of the dies, as in the two other heads.

Fig. 13 represents a die-holder, E, having an opening in which is detachably fitted the shank m of a rocking lever. Figs. 15 and 16 represent a rocking lever directly connected to the die by a pin.

From the foregoing it will be observed that my invention is subdivided into several dis ti nct principles of construction not dependent upon each other, one or more of said principles being adapted to beincorporated in the same machine as desired.

Simplicity of construction and minimum number of working parts are features found alike in all the various forms shown. The rocking levers are connected directly to the dies or die holders, and are operated by a working-ring located outsideofthe plane of the said dies. Steel of any and varying length may be employed as dies when so desired,and the working-ring is positively actuated in movements both forward and return. The cam-ring section permits of rapid and exact change of parts, so as to cause the dies, when clamped in operative position, to be all at a greater or less distance fronra common center, and the flat bearings between the ring and levers insure the latter against the possibility of change of position until the ring releases them.

Other forms of embodying and using the principle of my invention may be employed in substitution for the specific forms herein shown. It will therefore be understood that omissions, substitutions, and changes may be made as regards the forms and parts herein set forth, provided the principles of construc tion embraced in the following claims are r(- tained and employed.

I therefore particularly point out and dis tinctly claim as my invention 1. In a boltcutter head, the combination, with a rocking lever having its forward extremity directly and positively secured to a die or die-holder, of a ring located outside and rearward of the plane of the die, said ring having engagement with said lever forward of its pivotal plane to move its forward extremity toward the head-axis, whereby the die is actuated in a corresponding movement directly by the lever, substantially as set forth.

2. In a bolt-cutter head, the combination, with a rocking lever having its forward extremity directly and positively secured to a die or die-holder, of'a ring located outside and rearward of the plane of the die, said ring engaging with the lever forward of its pivotal plane to move the die toward the head-axis, and engaging with said lever rearward of its pivotal line to move the die from the headaxis, substantially as set forth.

3. In a bolt-cutter head, the combination, with rockinglever A, of ring 0, provided with inner peripheral cam, h, on its forward portion, engaging with said lever forward of its pivotal point, substantially as set forth.

4. Inabolt-cutterhead,the combination,with ring 0, having the two series of inner peripheral cams, h and h, respectively formed in its forward and rear portions, of rocking levers A, respectively adapted to engage at points forward of their fulcrums with said cam series h, and at points rearward of their fulcrums with said cam series h, substantially as set forth.

5. In a bolt-cutter head, the combination, with rocking levers A, respectively provided with flat bearings Z, located forward of their pivotal points, of ring 0, having the series of inner peripheral cams, h, formed on its forward portion, said cams having engagement with said flat bearings to 1001; the levers against accidental movement tending to move their forward extremities from the head-axis, substantially as set forth.

6. In a bolt-cutter head, the combination, with ring 0, having the series of inner peripheral cams, h, formed on its rear portion, of curved rocking levers A, respectively provided with flat bearings rearward of their pivotal points, said ring being located outside and in rear of the plane of the dies,and adapted by the engagement of saidparts h and is to lock the curved levers against accidental movement tending to move their forward extremities toward the axis of the head, substantially as set forth.

7. In a bolt-cutter head made without a ring in the plane of the dies, the combination,with ring 0, having the two series of inner peripheral cams, h and h, respectively formed in its fGlWZLXG and rear ortions of rockin levers 7 A, having forward and rear flat bc arings,Z and It, substantially as set forth.

8. In a boltcutter head, the combination, with rocking levers A, of ring D and ring 0, adapted to have circular adjustment relative to the latter, both said rings being located outside ancl in rear of the plane of the dies, said ring 0 having the two series of inner periph eral cams, h and h, respectively formed in its forward and rear portions, and respectively engaging with said levers at points forward and rearward of their fulcrums, substantially as set forth.

9. In a bolt-cutter head, the combination, with a die and a rocking-lever, of a ring having two peripheral cams, respectively adapted to engage with said lever at points on opposite sidcs of an intermediate line passing through the center of movement of the lever, substantially as set forth.

10. In a bolt-cutter head, the combination, with a ring having circular and endwise movements, of a rocking lever having engagement with two cams formed on the inner periphery of the ring, substantially as set forth.

In testimony that I claim the foregoing to be my invention I have hereunto set my hand this 25th day of March, A. D. 1884.

MICHEL D. LUEHRS.

\Vitncsses:

Tnos. B. HALL, JNo. G. HALL. 

